Bitcoin is a terminal threat to the Mastercard/Visa skim, too.
It’s easy to get the skim back (and more) with rebates or points.
Not for the merchant.
Look what the banksters did to Walmart when they tried to cut out the Mastercard/Visa skim.
Wal-Mart Defends Its Bid to Enter Banking
There is no reason in the world that Mastercard/Visa should make more profit on a Walmart transaction than Walmart does, other than the greed of the big-government/big-corporate criminal fascist complex.